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Chemicals, plastics and rubber industries

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Abstracts » Chemicals, plastics and rubber industries

Direct synthesis and characterization of hydrophobic aluminum-free Ti-beta zeolite

Article Abstract:

Experiments were performed to investigate the physicochemical properties of aluminum-free titanium-beta zeolites (Ti-Beta). The synthesis of the zeolites and their catalytic behavior were examined. No competition in the crystalline phases were detected by X-ray diffraction studies. The findings demonstrate the feasibility of integrating titanium in pure silica and aluminosilicate zeolite Beta in fluoride medium. Moreover, differences in the synthesis of Beta materials in fluoride and hydroxide media were observed which in turn influence the polar character of the samples.

Author: Corma, A., Perdigon-Melon, J.A., Camblor, M.A., Blasco, T., Esteve, P., Guil, J.M., Martinez, A., Valencia, S.
Publisher: American Chemical Society
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 1998
Organic compounds, Zeolites, Catalysis

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Surface segregation in supported Pd-Pt nanoclusters and alloys

Article Abstract:

Surface segregation mechanisms in Pd-Pt alloys and bimetallic Pd-Pt nanoclusters on alumina and carbon supports were studied by obtaining the metal surface composition of these systems through low-energy ion scattering. Pd surface segregation was enhanced by heating the alloys in hydrogen or oxygen, and thermodynamic equilibrium was attained at approximately 400-500 deg C. For Pd-Pt catalysts with low metal dispersions of about 0.3 and 0.8, pd surface segregation occurred during heating in hydrogen to about the same extent as in the Pd-Pt bulk alloys.

Author: Veen, J.A.R. van, Oetelaar, L.C.A. van den, Nooij, O.W., Oerlemans, S., Gon, A.W. Denier van der, Brongersma, H.H., Lefferts, L., Roosenbrand, A.G.
Publisher: American Chemical Society
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 1998
Analysis, Platinum, Palladium, Metal catalysts, Alloys

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Synthesis and characterization of acidic high-silica faujasite-type gallosilicates

Article Abstract:

It is much more difficult to insert gallium into faujasite (FAU)-type silicas than to insert aluminium. FAU-type gallosilicates are inert to ammonium hexafluorosilicate.

Author: Maesen, Th. L.M., Veen, J.A.R. van, Cooper, D.A., Vegchel, I.M. van, Gosselink, J.W.
Publisher: American Chemical Society
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 2000
Isotopes, Gallium

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Subjects list: Research, Aluminum silicates
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